Observer design error when the desire poles are equals ?

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Mohammed kandeel 2018-5-12

编辑： Ngoc Thanh Hung Bui 2018-5-13

I try to design full order observer with the following

G = [0 20.6; 1 0];

C = [0 1];

obsv_poles = [-10; -10];

ke = place(G',C',obsv_poles);

eig(G-ke'*C);

but i have the following error

Error using place (line 78) The "place" command cannot place poles with multiplicity greater than rank(B).

Ngoc Thanh Hung Bui 2018-5-13

编辑：Ngoc Thanh Hung Bui 2018-5-13

what are G and C??? did you check the observability of the system yet

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